Abstract:
:Extracts of serum-free conditioned medium from human rhabdomyosarcoma A673 cells contain high molecular weight (HMW) transforming growth factors (TGFs) that can be partially purified by Bio-Gel P-100 and carboxymethyl (CM)-cellulose chromatography (Todaro et al: Proc Natl Acad Sci USA 77:5258, 1980). Reverse-phase high performance liquid chromatography (HPLC) revealed a principal peak of epidermal growth factor (EGF) radioreceptor assay (RRA) activity and anchorage-independent growth (AIG) activity that coeluted with 25-26% acetonitrile. If a trailing shoulder of EGF RRA activity from the CM-C chromatography was included in the material for HPLC analysis, additional active fractions were observed at 21-22% acetonitrile. Importantly, both active regions from HPLC failed to compete in radioimmunoassays under reduced and denatured conditions for human EGF (hEGF), human TGF-alpha (hTGF-alpha), or rat TGF-alpha (rTGF-alpha) and failed to give positive signals in Western blots under conditions in which TGF-alpha was readily detected when using an antisera raised against the 17 C-terminal amino acids of rTGF-alpha. Nonreducing sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) revealed EGF RRA and AIG activities in gel slices corresponding to Mr 15,000 and 22,000 in the 25-26% acetonitrile eluate and Mr 15,000, 20,000, 27,000, and 48,000 in the 21-22% acetonitrile eluate. The presence of multiple forms of EGF-receptor-binding peptides produced in vitro suggest size heterogeneity and possible immunologic diversity among high molecular weight members of the EGF/TGF-alpha family of growth-promoting polypeptides.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Stromberg K,Hudgins WR,Fryling CM,Hazarika P,Dedman JR,Pardue RL,Hargreaves WR,Orth DNdoi
10.1002/jcb.240320402subject
Has Abstractpub_date
1986-01-01 00:00:00pages
247-59issue
4eissn
0730-2312issn
1097-4644journal_volume
32pub_type
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